<template>
    <div>
        <!--使用面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!--卡片视图区-->
        <el-card>

            <!--头部警告区-->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数"
                type="warning"
                :closable="false"
                show-icon="">
            </el-alert>

            <!--选择商品分类区域-->
            <el-row class="cat_opt">
                <el-col>
                    <span>选中商品分类：</span>
                    <!--选择商品分类的级联选择框-->
                    <el-cascader
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"></el-cascader>
                </el-col>
            </el-row>

            <!--tab页签区域  activeName被激活的页签名称-->
            <el-tabs v-model="activeName" @tab-click="handleClick">
                <!--添加动态参数的面板-->
                <el-tab-pane label="动态参数" name="many">
                    <!--添加参数的按钮-->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!--动态参数表格-->
                    <el-table :data="manyTableData" border stripe="">
                        <!--展开列-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!--循环渲染tag标签-->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!--输入文本框-->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!--添加按钮-->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!--索引列-->
                        <el-table-column type="index"> </el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"> </el-table-column>
                        <el-table-column label="操作"> 
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!--添加静态属性的面板-->
                <el-tab-pane label="静态属性" name="only">
                    <!--添加属性的按钮-->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!--静态属性表格-->
                    <el-table :data="onlyTableData" border stripe="">
                        <!--展开列-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!--循环渲染tag标签-->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!--输入文本框-->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!--添加按钮-->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!--索引列-->
                        <el-table-column type="index"> </el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"> </el-table-column>
                        <el-table-column label="操作"> 
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>


        </el-card>

        <!--添加参数的对话框-->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>

        <!--修改参数的对话框-->
        <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>

    </div>
</template>

<script>
export default {
    data(){
        return{
            //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'              
            },
            //级联选择框双向绑定到的数组
            selectedCateKeys:[],
            //被激活的页签的名称
            activeName:'many',
            //动态参数数据
            manyTableData:[],
            //静态参数数据
            onlyTableData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible:false,
            //添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[{required: true, message: '请输入参数名称', trigger: 'blur' }]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible:false,
            //修改的表单数据对象
            editForm:{},
            //修改表单的验证规则对象
            editFormRules:{
                attr_name:[{required: true, message: '请输入参数名称', trigger: 'blur' }]
            },
            
            
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有的商品分类列表
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品列表失败')
            }
            this.catelist=res.data
            console.log(this.catelist)
        },
        //级联选择框选中项变化会触发
        handleChange(){
            this.getParamsData()
        },
        //tab页签点击事件的处理函数
        handleClick(){
            console.log(this.activeName)
            this.getParamsData()
        },
        //获取参数的列表数据
        async getParamsData(){
            //console.log(this.selectedCateKeys)
            //证明选中的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            //证明选的是三级分类
            //根据所选分类Id和当前所处的面板获取对应的参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败')
            }
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals? item.attr_vals.split(' '):[]
                //控制文本框的显示与隐藏
                item.inputVisible=false
                //文本框中输入的值
                item.inputValue=''
            })
            console.log(res.data)
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        //监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return
                }
                const {data:res}= await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible=false
                this.getParamsData()
            })
        },
        //点击按钮展示修改的对话框
        async showEditDialog(attrId){
            //查询当前参数信息
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取信息失败')
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },
        //重置修改表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮，修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                const{data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status!==200){
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible=false
            })
        },
        //根据id删除对应参数项
        async removeParams(attrId){
            const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
             type: 'warning'
            }).catch(err=>err)
            //用户取消了删除操作
            if(confirmResult!=='confirm'){
                return this.$message.info('已取消删除')
            }
            //删除业务逻辑
            const {data:res}= await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)

            if(res.meta.status!==200){
                return this.$message.error('删除参数失败')
            }
            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        //文本框失去焦点或按下enter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            //如果没有return 则证明输入的内容需要做处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            this.saveAttrVals(row)

        },
        //将对attr_vals的操作，保存到数据库
        async saveAttrVals(row){
            //需要发起请求
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status!==200){
                return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功')
        },
        //点击按钮展示文本输入框
        showInput(row){
            row.inputVisible=true
            //让文本框自动获得焦点
            //$nextTick方法作用 当页面上元素本重新渲染后才会执行回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)

        }
    },
    computed:{
        //如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        //当前选中的三级分类的Id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>
